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Finding the Fourth Proportional to 28,470.78, 42,706.98 and 8,747.28

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Solution

The fourth proportional to 28,470.78, 42,706.98 and 8,747.28 is: 13,121.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,470.78 : 42,706.98 = 8,747.28 : x
  2. Step 2: Convert to fraction form
    28,470.78/42,706.98 = 8,747.28/x
  3. Step 3: Cross multiply
    28,470.78x = 42,706.98 × 8,747.28
  4. Step 4: Simplify right side
    28,470.78x = 373,569,912.01
  5. Step 5: Solve for x
    x = 373,569,912.01/28,470.78
  6. Step 6: Final answer
    x = 13,121.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.